Tanner (AGS 15) - Naval Cruise Book

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'i QU, I coal Q if W fzfmalfzifafa Navigational charts are a prerequisite for the effectiveness of a marine force. The mission of the 'survey fleet is to collect the data which is presented on these navigational charts. Using modern methods ofelectronic positioningfsuch as lorac and shoranj, the tirst step in our survey operations is to accurately determine the geographic position of the antennae on the beach. This is the type of work we were doing as we sent parties ashore with Tellurometer Cdevice for measuring distancej and other instruments to Forur, Bani, Sirri, Musa, Tunb and Nabiyu Tunb Islands. The second step is normally a service of the Hydrographic Office, but this season TAN- NER manufactured her own boat 'sheets with imprinted lines of position in reference to the an- tennae. Determination of the position of TANNER and her soundboats anywhere in the area of the lorac or shoran net at the same instant that measurment of the depth of water is recorded on the fathometer in the next step, which is effected through use of a highly sensitives radio receiver with counter dials. Tide guages are installed at various locations in the area to determine the act- ual height of tide at the time of each sounding,and then the Soundings are corrected to show what the water depth will be at low tide, this is the value printed on a navigational chart. This is ne- cessary so that the mariner can depend on the water being as deep or deeper than charted. 'Ihere are numerous other small tasks performed during a survey season to provide other es- sential infonnation, but the determination of accurate depths and their location is our primary miss- ion.

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i L i i 1 I I I 'J l gift! IDL.. Jw r lf' ,f Y X if 'mtv- f M W, . ,, SHIP'S HISTORY On 5 january, 1945, the U,S.S, PAMINA CAKA-34D slid down the ways at the Walsh-Kaiser Shipyard in Providence, Rhode Island. She was assigned to the Pacific Fleet, where she served from April, 1945 until january, 1946. Her life as an AKA was short, however, as destiny decreed that she should be converted to a hydrographic survey ship. In March, she returned to the East Coast to Norfolk, Virginia, and at the Norfolk Naval Ship- yard, her metamorphosis was initiated. Conversion is assumed to have been complet ed in Septem- ber of 1946, when she was re-commissioned the U,S,S, TANNER CAGS-155 in honor of the late Lera Luther Tanner, Captain, U.S. Navy C1835-l906D, an authority on oceanography and the inven- tor of an early type of sounding machine. Her first year and a half as a hydrographic survey ship, found her off the coast of Mexico, and since that time, the TANNER has sailed to the four corners of the world. She has made four trips each to theBahama 1S1andS,Labrador and Newfoundland and the 'Eastern Mediterranean. The 1959- 60 and 1960-61 survey seasons were spent in the Persian Gulf area. Her primary mission is to provide hydrographic data for the construction of modern up-to-date navigation charts which en- able mariners to navigate safely as they ply the sea lanes of the world. . The operations of a survey task unit are both complex and demanding. To cope with the pe- culiar problems that arise in a far-off area, the TANNRR employs helicopter and marine detach- ments. Four 52 foot sounding boats, four landing craft, two amphibious DUKWS as well as many thousands of dollars worth of electronic equipment are utilized to gather vast quantities of infor- mation that is sent to the I-Iydrographic Office in Washington, D.C. for interpretation and publica- tion. She is a logistic as well as surveying ship, carrying supplies and stores for the beach camps that propagate the electronic signal used in sounding unit positioning. l df?-